Question

relative abundances $^1H = 99.99\%$ $^{12}C = 98.93\%$ $^{79}Br = 50.69\%$ $^2H = 0.01\%$ $^{13}C = 1.07\%$ $^{81}Br = 49.31\%$ 1. What is the molecular formula of bromobenzene? 2. What is the nominal (integer) molecular weight (M) of bromobenzene in which the C, H, and Br atoms are all in the form of their most common isotopes? 3. Consider bromobenzene molecular ions with the nominal/integer masses shown below (where M = answer to question 2). Predict the integer m/z value and all possible isotopic compositions for each ion. ion m/z isotopic composition(s) M M+1 M+2 4. What is the least likely isotopic composition of the M+2 ion of bromobenzene (hint - consider isotopic abundances)?

          relative abundances
$^1H = 99.99\%$
$^{12}C = 98.93\%$
$^{79}Br = 50.69\%$
$^2H = 0.01\%$
$^{13}C = 1.07\%$
$^{81}Br = 49.31\%$
1. What is the molecular formula of bromobenzene?
2. What is the nominal (integer) molecular weight (M) of bromobenzene in which the C, H, and Br
atoms are all in the form of their most common isotopes?
3. Consider bromobenzene molecular ions with the nominal/integer masses shown below (where M =
answer to question 2). Predict the integer m/z value and all possible isotopic compositions for each
ion.
ion	m/z	isotopic composition(s)
M
M+1
M+2
4. What is the least likely isotopic composition of the M+2 ion of bromobenzene (hint - consider
isotopic abundances)?

relative abundances 1h 9999 12c 9893 79br 5069 2h 001 13c 107 81br 4931 1 what is the molecular formula of bromobenzene 2 what is the nominal integer molecular weight m of bromobenzene in wh 24216

Added by Ivan M.

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